comment on

I am trying to generate graphs of my wiki -- incoming pages (I keep track of trackbacks), and outgoing pages from the current page. Using GraphViz, I can do this quite easily. However, I have two problems with running GraphViz module (and/or the GraphViz program) via the web on Win32 with ActiveState.

the program runs fine on command line, and generates an image map and the image (except, it insists on assigning "test" to both map id and map name!), but it hangs when run via the web. Generates a 0kb image, and just hangs. Perl and circo.exe both peg the CPU and memory. Read GraphViz , apache, but that doesn't seem to apply to me (although the problem described there is identical to mine). That monk is using Debian, I am using Win32. I added a SetEnv HOME /tmp/ setting to httpd.conf, but that doesn't help. Read Generating clickable graphs, and added a Path var to my cgi, but that doesn't help. What is going on here?
Update: added sample code on Anonymonk's castigation --
```
use GraphViz;

my $g = GraphViz->new(
  directed => 1, 
  layout => 'circo', 
  ratio => 'compress', 
  width => 6,
  height => 6, 
  node => {shape => 'ellipse'},
);

..
add nodes and edges
..

my $image = 'foo';

open OUT_FILE, ">$image.png" or die $!;
binmode (OUT_FILE);
$g->as_png(\*OUT_FILE);
close OUT_FILE;

my $cmap  = $g->as_cmapx;

print <<END;
Content-Type: text/html\n\n

<html>
  <head>
    <title>test</title>
    $cmap
  </head>
  <body>
    <img src="$image.png" border="0" usemap="#test">
  </body>
</html>

END
[download]
```
The pngs produced by GraphViz are butt-ugly. SVG creates nice output, but can't do image maps, and outputting PostScript and then running Ghostview on it is way too complicated. Any other solutions?

Any suggestions? Or suggested replacement for GraphViz for this? There are a number of Java network viz libs out there, but I want to stay away from Java as much as possible.

--

when small people start casting long shadows, it is time to go to bed

In reply to Problems with GraphViz module by punkish

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